#include <iostream>
using namespace std;
int main()
{
	int arr[] = { 5650, 4542, 3554, 473, 946, 4114, 3871, 9073, 90, 4329,
		2758, 7949, 6113, 5659, 5245, 7432, 3051, 4434, 6704, 3594,
		9937, 1173, 6866, 3397, 4759, 7557, 3070, 2287, 1453, 9899,
		1486, 5722, 3135, 1170, 4014, 5510, 5120, 729, 2880, 9019,
		2049, 698, 4582, 4346, 4427, 646, 9742, 7340, 1230, 7683,
		5693, 7015, 6887, 7381, 4172, 4341, 2909, 2027, 7355, 5649,
		6701, 6645, 1671, 5978, 2704, 9926, 295, 3125, 3878, 6785,
		2066, 4247, 4800, 1578, 6652, 4616, 1113, 6205, 3264, 2915,
		3966, 5291, 2904, 1285, 2193, 1428, 2265, 8730, 9436, 7074,
		689, 5510, 8243, 6114, 337, 4096, 8199, 7313, 3685, 211 };

	long long int temp = 1;
	unsigned int zeronum = 0;
	/*
	int arr_size = sizeof(arr) / sizeof(arr[0]);
	for (int i = 0; i < arr_size; i++){
		temp *= arr[i];
		*/
	for (auto i : arr){
		temp *= i;
		if (temp % 10 == 0){
			temp /= 10;
			zeronum++;
		}
	}
	
	printf("%d", zeronum);
	return 0;
}